Working kernel version: 3.3.0 Failing kernel version: 3.7.8 Distribution: Gentoo Hardware Environment: HP Proliant DL360 G4 / Intel Xeon Smart Array controller: Compaq Smart Array 64xx (rev 01) / 6i Kernel configuration: cciss driver built-in Problem Description: The system fails to boot after a kernel upgrade to >=3.7.8, with "kernel panic unable to mount root filesystem" (attachment 1 [details] & 2). The old 3.3.0 kernel still boots the system without any issue. After a bit of googling I found a similiar(?) issue dated 2009: http://lkml.indiana.edu/hypermail/linux/kernel/0901.1/01040.html To test I accessed the system via the ilo board and did following change to the interactive grub console: linux /vmlinuz root=/dev/cciss/c0d0p3 ro acpi=off to linux /vmlinuz root=/dev/cciss!c0d0p3 ro acpi=off and the system boots just fine even with kernel 3.7.8 (attachment 3 [details] & 4).
Created attachment 93551 [details] Initial grub config working with 3.3.0 and failing to boot 3.7.8
Created attachment 93561 [details] Actual error when trying to boot 3.7.8
Created attachment 93571 [details] Altered grub config which succeeds booting 3.7.8
Created attachment 93581 [details] System comming up with the altered grub config and 3.7.8